It matters because that boy [a boy, despite being older than Bree--emotionally, he's very much the younger one] hasn't had many people in his life he considers friends. It's easy to give up on him. You know I'm fine with the two of you not being thick as thieves, but I don't want you to think it's because of you.

[She's sure Theon's at least told Bree something of his upbringing. It doesn't breed a lot of trust, that sort of life.]

But he's getting better. The way he is now is a vast improvement in comparison to how he was.